How to hide from UNIX strings - obfuscate or hide a literal or constant?
Hi,
I need to somehow pipe the password to a command and run some SQL, for example, something like echo $password | sqlplus -s system @query01.sql
To make it not so obvious, I decided to try out writing a small C program that basically just do echo $password. So now I just do x9.out | sqlplus -s system@query01.sql.
I understand it still is not a secure thing to do as someone can just run x9.out and knows the password. Anyway, the intent is to make is less obvious that I am echo'ing a password so I am more than happy with that for the time being as a start.
Unfortunately, as you can see if I do a strings of the x9.out file, it is quite obvious that the word hello stands out.
Can anyone please advise how I can somehow hide that word in the bushes ?
For example, maybe I can do a printf of the ASCII values of the word so that if anyone do a strings of it, it shows number instead of words.
Finally, eventually, I would want to put something more into the code so that it will be an array that stores a list of username+password, so that if I do x9.out user01 it prints the password of user01, x9.out user02 prints the password of user02 and so on. It will probably be wise that it prompts for a username/password before it allows me to display the information.
BTW, it would be nice if I can put the whole "echo $password | sqlplus -s system" string into the C program so that I only do x9.out @query01.sql so it hides the username and password. I don't see how that they can be done, maybe one of the gurus can advice how to do that.
Anyway for now, I just want to know how to hide from UNIX strings :-)
Last edited by newbie_01; 03-08-2014 at 05:41 AM..
Reason: Adding more info
Hello everyone,
i am new to unix and still learning about different commands. Can some one tell me how can i hide my directory name. For instance someone is logged in a directory named $ .
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by other users also
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Sireesha (1 Reply)
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Patrick (1 Reply)
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Hi,
By reporting the process status with ps, any Unix user will see the command line arguments
#ps -ef
UID PID PPID C STIME TTY TIME CMD
lsc 13837 13825 0 May 11 pts/17 0:01 -ksh
oracle 4698 6294 0 12:00:40 ? 0:00 sqlplus -s system/manager
appluser 4229 4062 0 12:00:03... (2 Replies)
I'm listing the files in a particular directory using the ls command...
$ ls -ogh
total 9.4G
-rw-r--r-- 1 1.9G Nov 4 02:29 file1.tar
-rw-r--r-- 1 1.9G Nov 11 03:11 file2.tar
-rw-r--r-- 1 1.9G Nov 18 02:55 file3.tar
-rw-r--r-- 1 1.9G Nov 25 03:11 file4.tar
-rw-r--r-- 1 1.9G Dec 2 02:46... (3 Replies)
Hi,
I my unix we have one file that contains all the database credentials.
we are calling that file while connecting databse.
I need to hide that file....other user should not view that file.
How to do this. Please suggest me apart from permisstion(chmod) level suggestion.
Regards,... (3 Replies)
Discussion started by: rsivasan
3 Replies
LEARN ABOUT ULTRIX
su
su(1) General Commands Manual su(1)Name
su - substitute a user ID
Syntax
su [username]
su - [username]
su -f [username]
Description
The command requests the password of the specified username. If the correct password is given, changes to that username without changing
the current directory. The user environment is unchanged except for HOME and SHELL which are taken from the password file entry for user-
name. The shell that is run is also taken from the password file entry for username. The new user ID stays in force until the shell
exits.
If no username is specified, `root' is assumed. To remind the superuser of his responsibilities, the shell substitutes `#' for its usual
prompt.
Options-f Prevents from executing the .cshrc file, making start up faster.
- Simulates a full login.
Diagnostics
Sorry
An invalid password was supplied for the specified username.
Unknown login: username
The specified username was not found in the passwd database.
No directory
The home directory for the username is not accessible at this time (only with ``-'' argument).
No shell
The shell specified in the passwd database entry for username could not be executed.
Kerberos initialization failure
Consult your system administrator.
If enhanced security features are enabled the following error messages are also possible:
Requires secure terminal
Attempt to su to UID 0 on a line that is not marked secure in
User's password has expired
Access is denied because the password for username is expired.
This account is disabled
Access is denied because the auth entry corresponding to username is marked disabled.
Files
Log file of anyone who became
root, with a date mark.
See Alsocsh(1), sh(1), passwd(5yp), environ(7), edauth(8)
Security Guide for Administrators
Security Guide for Users
su(1)
03-08-2014
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